[viraptor]

Depends how well the project is structured. Imagine that you're writing a function that adds some values to a hashmap. Would you rather have the the logic, the hashing, and the datastructure details in that function? Getting a shorter function and reduced complexity in that function is great, even if it doesn't affect the complexity of the whole project.

If the modules are well-designed, you can ignore how the hashmap works and the details of hashing itself. You'll get at least 4 extra files, but yes, it's very likely worth it.